Vermintide Potion Glitch - YouTube Video Here
No weirdness in the game up until this point, I was not the host. I picked up the dwarf and gave him a pot, then I couldnt put my hands back down.
I tried switching weapons, using my ult, attacking, blocking. getting tornadoed, jumping off a ledge and being picked back up. when I looked at teamates the prompt to give potions came up but nothing happened when I tried.
At 1:40 in the video, the dwarf (who was fine up until this point) gave me the potion back, and became stuck in the animation as well. After the dwarf died I picked him back up at 4:10, waited a bit longer to give the potion this time and it happened again.
What eventually worked was dying full and being picked back up, or picking up a barrel or another potion lying on the ground. med kits did not help.